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Standard Dimension Design: This 15-pack 3ml pen cartridge features uniform sizing with 3ml capacity and 11mm long stopper, delivering precise dimensions for smooth installation and daily storage. Tight Sealing Construction: Designed with fine stoppers and aluminum tops, this pen cartridge bottle forms a tight closed structure. It stops liquid overflow and keeps stable performance in daily storage and handling. Individual Packaging: Every single pen cartridge bottle adopts individual outer packaging. It isolates external dirt and fine debris to keep each piece clean and well preserved before daily opening and application. Broad Compatibility: This 3ml pen cartridge fits various portable pen tools from V1 to V2 series. It allows quick assembly and flexible combination to suit different daily using habits and routine needs. Durable Structural Design: Crafted with solid glass structural design, this 3ml pen cartridge ensures great durability. Exquisite workmanship boosts overall stability to support repeated filling and daily placement.